Method of manufacturing incandescent lamps



M. H. BRANIN.

METHOD OF MANUFACTURING INCANIlESCENT LAMPS.

APPLICATION FILED SEPT 26,1916.

Patented Sept. 9, 1919.

I UNITED STATES PATENT OFFICE.

MARK H. BRANIN, QF NEWARK, NEW JERSEY, ASSIGNOB TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

METHOD or mnnorncrunme Incmnnscmwr LAMPS.

To all whom it may concern Speciflcation of Letters Patent.

Patented Sept. 9, 1919.

Application and September 26, me. Serial in. 122,296.

Referring-Ito the accompanying drawings Be it known that 1, MARK H.BRANIN, in which corresponding parts are designed a citizen of theUnited States, residing at by corresponding marks of reference Newark,county of Essex, State of New Jersey, have invented certain new anduseful Improvements in Methods of Manufacturihg Incandescent Lamps, ofwhich the following-is a specification.

My inven on" relates to the art of manu facturin tages. My invent on;also resides in a novel form of bulbused in the manufacturing process.

It hasheretofore been the practice to blow 'thebulbs for el'ectricla'msjwith necks-of .cen'siderably' greater len'gt than are necessary in themanufacture of the lamp itself,

suchlInecks' terminating in restricted ends.

1 the mount thereon; and my invention also,

Such restricted-endshave. heretofore,as a preliminary stepjto themanufacture. of the lamp been-broken ofi...to permit the insertion ofthemountin such necks, and the sealingof'the mount therein. Thisis objectionablei both from the fact that the breaking ofi of the end of theneck of the bulb involves 7 an, additional step, and because aconsiderable loss has resulted from the breakage' of the bulbs in thisstep. I

propose to construct a bulb ready for the insertion and scaling in ofthe mount support without necessitating the removal of any part of thebulb prior to this step, and my improved method of manufacture thereforemay be said to consist'in so blowing I a the glass atthis. point, whicheventually,by

thebulb that the mount may be inserted and sealed therein withoutsubstantial intermediate change in the bulb, and in sealing consists ina glass bulb, as an article of manelectric incandescent lamps and,lnfaccor ance therewith I have lmproved the .ufacture, ready for, andadapted to, the insertion of the filament mount therein,

whereby lamp bulbs with formed necks may be shipped from the glassblowing factory to the lamp factory readyfor the sealing operation andthereby eliminating the necessityof the intermediate step of crackingoff the restricted necks. I v

According to another feature of my invention, I make the neck of suchform and weight that the sealing operationis greatly expedited, therebyincreasing the capacity of the sealing machines.

being represented in .neck is then broken 0 I wiper D to .the heated andlarge ,Zone I), this from the bulbs now commonly employed for thatpurpose.

- Figs. 5, 6, 7 and 8 retpresent successive steps in the manufacture 0an electric lamp from the bulb here described.

It will be proper in order that the see e and nature of my invention maybe t o better understood, to briefly describe' what is now thecommonpractice in the manu- --facture of electric lamp bulbs. The bulb reachesthe facto'ry with a neck considerably v greater .in length than isrequired in the completed article, this terminatin in a restrictedportion a, above which 1s an enlar ed zone 1). After a'tube d has been'sea ed in the bottom of the .bulb for the vpurposeof exhausting it, theneck of the ulb is placed-within heated metal zones B, which, bycontacting with the enlarged zone I) of the bulb, heats the sameft hisstep :1. The end ofthe y applying a et.

bein' shown inFig. 2, and the .resultis the brea 'ng off of therestricted .end of the neck, leaving. the bulb in the shape shown inFig. 3. A mount E carrying the filament is now insertedin the neck ofthe bulb, the bulb itself being held with the neck down, and the bulb ispassed between burners-F which project a flame upon the neck thereofadjacent to the end of the mount, melting the weight of the neck below,isd rawn out with 'a restriction in diameter, and seals itself to theend of the mount as shown in facture and having a sufficiently greatinternal diameter to, permit the passage of the base of the mounttherethrough. Such a bulb after tabulatiom-fis represented in n the bulbof this shape may be....inserted the filament support withoutpreliminary steps or operations upon the bulb. A filainent so insertedand being sealed is shown in Fig. 7. Withthe use of 'the neck ringshown, the period'of sealing is somewhat lessened due to the fact thatthe weight of the neck ring facilitates the drawing out of the neck andaids in the restriction in diameter of the neck at, the point where theseal is to be located. This is an improvement over the old way ofproviding positive means for drawing out the neck. "After the sealing,the result of this restriction is the lamp shown in Fig. 8, which itwill be seen is identical with thebulb shown inFigh 5 as the product ofthe present process.

It will be notedthat my invention calls for no additional operation inthe manufacture of the lamp, but eliminates several operations which arenow necessary. By so doing, it expedites the manufacture of a lamp, andthis is also aided by the increased speed of sealing in, due to theweight of the neck 4. Moreover, it is of value in that it tual use inthe manufacture'of electric lamps has been blown wlth a neck ringthereon, but in so far as I am aware, this neck ring and the neck of thebulb itself were not of a of the bulb and not as an incident to themanufacture of the lamp and were necessarily removed from the bulb priorto the insertion of the mount therein.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is:

The process of manufacturing electric incandescent lamps, which consistsin blowing a bulb with an elongated unrestricted neck terminating in aring therearound having substantial weight, and subsequently withoutsubstantial intermediate change of the said bulb inserting a filamentmount in the neck, heating the neck, and allowing it to be reduced indiameter by the Weight of the ring to seal with the mount."

In witness whereof, I have hereunto set my hand this 21st day ofSeptember 1916.

MARK H. .BRANIN.

